package demo.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

/**
 * 请求 hello.htm 时要进入的filter
 * 
 * @author Administrator
 * 2012-9-2下午3:21:25
 */
public class HelloFilter implements Filter {

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		System.out.println("===> HelloFilter 初始化成功！3");
	}

	@Override
	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {
	    
		HttpServletRequest request = (HttpServletRequest)req;
		
		System.out.println("===> HelloFilter 被调用！");
		System.out.println("拦截 URI="+request.getRequestURI());
		
		chain.doFilter(req, res);
	}
	
	@Override
	public void destroy() {
		System.out.println("===> HelloFilter 销毁！3");
	}
}
